"""Build optional cython modules.""" import os from distutils.command.build_ext import build_ext from typing import Any class BuildExt(build_ext): def build_extensions(self) -> None: try: super().build_extensions() except Exception: pass def build(setup_kwargs: Any) -> None: if os.environ.get("SKIP_CYTHON", False): return try: from Cython.Build import cythonize setup_kwargs.update( dict( ext_modules=cythonize( [ "src/zeroconf/_cache.py", "src/zeroconf/_dns.py", "src/zeroconf/_protocol/incoming.py", "src/zeroconf/_protocol/outgoing.py", ], compiler_directives={"language_level": "3"}, # Python 3 ), cmdclass=dict(build_ext=BuildExt), ) ) except Exception: if os.environ.get("REQUIRE_CYTHON"): raise pass